diff options
| -rw-r--r-- | drivers/usb/common/common.c | 20 | ||||
| -rw-r--r-- | include/linux/usb/otg.h | 1 |
2 files changed, 21 insertions, 0 deletions
diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c index 347fb3d3894a..c9bdeb4ddcb5 100644 --- a/drivers/usb/common/common.c +++ b/drivers/usb/common/common.c @@ -201,6 +201,26 @@ enum usb_dr_mode usb_get_dr_mode(struct device *dev) EXPORT_SYMBOL_GPL(usb_get_dr_mode); /** + * usb_get_role_switch_default_mode - Get default mode for given device + * @dev: Pointer to the given device + * + * The function gets string from property 'role-switch-default-mode', + * and returns the corresponding enum usb_dr_mode. + */ +enum usb_dr_mode usb_get_role_switch_default_mode(struct device *dev) +{ + const char *str; + int ret; + + ret = device_property_read_string(dev, "role-switch-default-mode", &str); + if (ret < 0) + return USB_DR_MODE_UNKNOWN; + + return usb_get_dr_mode_from_string(str); +} +EXPORT_SYMBOL_GPL(usb_get_role_switch_default_mode); + +/** * usb_decode_interval - Decode bInterval into the time expressed in 1us unit * @epd: The descriptor of the endpoint * @speed: The speed that the endpoint works as diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h index 7ceeecbb9e02..6475f880be37 100644 --- a/include/linux/usb/otg.h +++ b/include/linux/usb/otg.h @@ -128,5 +128,6 @@ enum usb_dr_mode { * and returns the corresponding enum usb_dr_mode */ extern enum usb_dr_mode usb_get_dr_mode(struct device *dev); +extern enum usb_dr_mode usb_get_role_switch_default_mode(struct device *dev); #endif /* __LINUX_USB_OTG_H */ |